Ivanesthi IR, Latifah E, Amrullah LF, Tseng YK, Chuang TH, Pan HC, Yang CS, Liu SY, Wang CC. Adaptation of a eukaryote-like ProRS to a prokaryote-like tRNAPro.
Nucleic Acids Res 2024;
52:7158-7170. [PMID:
38842939 PMCID:
PMC11229370 DOI:
10.1093/nar/gkae483]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 05/22/2024] [Accepted: 05/24/2024] [Indexed: 07/09/2024] Open
Abstract
Prolyl-tRNA synthetases (ProRSs) are unique among aminoacyl-tRNA synthetases (aaRSs) in having two distinct structural architectures across different organisms: prokaryote-like (P-type) and eukaryote/archaeon-like (E-type). Interestingly, Bacillus thuringiensis harbors both types, with P-type (BtProRS1) and E-type ProRS (BtProRS2) coexisting. Despite their differences, both enzymes are constitutively expressed and functional in vivo. Similar to BtProRS1, BtProRS2 selectively charges the P-type tRNAPro and displays higher halofuginone tolerance than canonical E-type ProRS. However, these two isozymes recognize the primary identity elements of the P-type tRNAPro-G72 and A73 in the acceptor stem-through distinct mechanisms. Moreover, BtProRS2 exhibits significantly higher tolerance to stresses (such as heat, hydrogen peroxide, and dithiothreitol) than BtProRS1 does. This study underscores how an E-type ProRS adapts to a P-type tRNAPro and how it may contribute to the bacterium's survival under stress conditions.
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